Hydrochloric Acid → 5-chloro-N-(2-chlorophenyl)pyridine-2-carboxamide

Participants

Reaction Steps

A mixture of 5-chloropyridine-2-carboxylic acid 5 (1.0 g, 6.35 mmol) and SOCl2 (2.4 mL) in DCM (10 mL) was stirred for 2 hours and concentrated. The residue was dissolved in DCM (20 mL). To the solution was added 2-chlorobenzenamine (1.0 g, 7.84 mmol) and then triethylamine (2.0 mL, 14.43 mmol). The reaction mixture was stirred overnight at ambient temperature and ethyl acetate (50 mL) was added followed by 1N HCl (10 mL). The organic phase was washed with water and brine, dried and concentrated under reduced pressure to yield a light yellow solid. Yield: 0.8 g, 47%. 5-chloro-N-(2-chlorophenyl)pyridine-2-carboxamide 6 was used for the next step without further purification.

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